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50acfb2b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fa60ce2c | 2 | /* |
8adf0536 JB |
3 | * stack_user.c |
4 | * | |
5 | * Code which interfaces ocfs2 with fs/dlm and a userspace stack. | |
6 | * | |
7 | * Copyright (C) 2007 Oracle. All rights reserved. | |
8adf0536 JB |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
6427a727 JB |
11 | #include <linux/fs.h> |
12 | #include <linux/miscdevice.h> | |
13 | #include <linux/mutex.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
6427a727 | 15 | #include <linux/reboot.h> |
c994c2eb | 16 | #include <linux/sched.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
8adf0536 JB |
18 | |
19 | #include "stackglue.h" | |
20 | ||
53da4939 | 21 | #include <linux/dlm_plock.h> |
8adf0536 | 22 | |
6427a727 JB |
23 | /* |
24 | * The control protocol starts with a handshake. Until the handshake | |
25 | * is complete, the control device will fail all write(2)s. | |
26 | * | |
27 | * The handshake is simple. First, the client reads until EOF. Each line | |
28 | * of output is a supported protocol tag. All protocol tags are a single | |
29 | * character followed by a two hex digit version number. Currently the | |
30 | * only things supported is T01, for "Text-base version 0x01". Next, the | |
de870ef0 JB |
31 | * client writes the version they would like to use, including the newline. |
32 | * Thus, the protocol tag is 'T01\n'. If the version tag written is | |
33 | * unknown, -EINVAL is returned. Once the negotiation is complete, the | |
34 | * client can start sending messages. | |
35 | * | |
d4b95eef | 36 | * The T01 protocol has three messages. First is the "SETN" message. |
3cfd4ab6 JB |
37 | * It has the following syntax: |
38 | * | |
39 | * SETN<space><8-char-hex-nodenum><newline> | |
40 | * | |
41 | * This is 14 characters. | |
42 | * | |
43 | * The "SETN" message must be the first message following the protocol. | |
44 | * It tells ocfs2_control the local node number. | |
45 | * | |
d4b95eef JB |
46 | * Next comes the "SETV" message. It has the following syntax: |
47 | * | |
48 | * SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> | |
49 | * | |
50 | * This is 11 characters. | |
51 | * | |
52 | * The "SETV" message sets the filesystem locking protocol version as | |
53 | * negotiated by the client. The client negotiates based on the maximum | |
54 | * version advertised in /sys/fs/ocfs2/max_locking_protocol. The major | |
55 | * number from the "SETV" message must match | |
e603cfb0 JB |
56 | * ocfs2_user_plugin.sp_max_proto.pv_major, and the minor number |
57 | * must be less than or equal to ...sp_max_version.pv_minor. | |
d4b95eef JB |
58 | * |
59 | * Once this information has been set, mounts will be allowed. From this | |
60 | * point on, the "DOWN" message can be sent for node down notification. | |
61 | * It has the following syntax: | |
de870ef0 JB |
62 | * |
63 | * DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> | |
64 | * | |
65 | * eg: | |
66 | * | |
67 | * DOWN 632A924FDD844190BDA93C0DF6B94899 00000001\n | |
68 | * | |
69 | * This is 47 characters. | |
6427a727 JB |
70 | */ |
71 | ||
462c7e6a JB |
72 | /* |
73 | * Whether or not the client has done the handshake. | |
74 | * For now, we have just one protocol version. | |
75 | */ | |
76 | #define OCFS2_CONTROL_PROTO "T01\n" | |
77 | #define OCFS2_CONTROL_PROTO_LEN 4 | |
3cfd4ab6 JB |
78 | |
79 | /* Handshake states */ | |
462c7e6a JB |
80 | #define OCFS2_CONTROL_HANDSHAKE_INVALID (0) |
81 | #define OCFS2_CONTROL_HANDSHAKE_READ (1) | |
3cfd4ab6 JB |
82 | #define OCFS2_CONTROL_HANDSHAKE_PROTOCOL (2) |
83 | #define OCFS2_CONTROL_HANDSHAKE_VALID (3) | |
84 | ||
85 | /* Messages */ | |
86 | #define OCFS2_CONTROL_MESSAGE_OP_LEN 4 | |
87 | #define OCFS2_CONTROL_MESSAGE_SETNODE_OP "SETN" | |
88 | #define OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN 14 | |
d4b95eef JB |
89 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_OP "SETV" |
90 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN 11 | |
3cfd4ab6 | 91 | #define OCFS2_CONTROL_MESSAGE_DOWN_OP "DOWN" |
de870ef0 JB |
92 | #define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47 |
93 | #define OCFS2_TEXT_UUID_LEN 32 | |
d4b95eef | 94 | #define OCFS2_CONTROL_MESSAGE_VERNUM_LEN 2 |
de870ef0 | 95 | #define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8 |
41503630 | 96 | #define VERSION_LOCK "version_lock" |
462c7e6a | 97 | |
3e834151 GR |
98 | enum ocfs2_connection_type { |
99 | WITH_CONTROLD, | |
100 | NO_CONTROLD | |
101 | }; | |
102 | ||
6427a727 JB |
103 | /* |
104 | * ocfs2_live_connection is refcounted because the filesystem and | |
105 | * miscdevice sides can detach in different order. Let's just be safe. | |
106 | */ | |
107 | struct ocfs2_live_connection { | |
108 | struct list_head oc_list; | |
109 | struct ocfs2_cluster_connection *oc_conn; | |
3e834151 | 110 | enum ocfs2_connection_type oc_type; |
66e188fc GR |
111 | atomic_t oc_this_node; |
112 | int oc_our_slot; | |
41503630 GR |
113 | struct dlm_lksb oc_version_lksb; |
114 | char oc_lvb[DLM_LVB_LEN]; | |
115 | struct completion oc_sync_wait; | |
c994c2eb | 116 | wait_queue_head_t oc_wait; |
6427a727 JB |
117 | }; |
118 | ||
462c7e6a JB |
119 | struct ocfs2_control_private { |
120 | struct list_head op_list; | |
121 | int op_state; | |
3cfd4ab6 | 122 | int op_this_node; |
d4b95eef | 123 | struct ocfs2_protocol_version op_proto; |
3cfd4ab6 JB |
124 | }; |
125 | ||
126 | /* SETN<space><8-char-hex-nodenum><newline> */ | |
127 | struct ocfs2_control_message_setn { | |
128 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
129 | char space; | |
130 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
131 | char newline; | |
132 | }; | |
133 | ||
d4b95eef JB |
134 | /* SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> */ |
135 | struct ocfs2_control_message_setv { | |
136 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
137 | char space1; | |
138 | char major[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
139 | char space2; | |
140 | char minor[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
141 | char newline; | |
142 | }; | |
143 | ||
3cfd4ab6 JB |
144 | /* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */ |
145 | struct ocfs2_control_message_down { | |
146 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
147 | char space1; | |
148 | char uuid[OCFS2_TEXT_UUID_LEN]; | |
149 | char space2; | |
150 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
151 | char newline; | |
152 | }; | |
153 | ||
154 | union ocfs2_control_message { | |
155 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
156 | struct ocfs2_control_message_setn u_setn; | |
d4b95eef | 157 | struct ocfs2_control_message_setv u_setv; |
3cfd4ab6 | 158 | struct ocfs2_control_message_down u_down; |
462c7e6a JB |
159 | }; |
160 | ||
a12630b1 | 161 | static struct ocfs2_stack_plugin ocfs2_user_plugin; |
cf4d8d75 | 162 | |
6427a727 | 163 | static atomic_t ocfs2_control_opened; |
3cfd4ab6 | 164 | static int ocfs2_control_this_node = -1; |
d4b95eef | 165 | static struct ocfs2_protocol_version running_proto; |
6427a727 JB |
166 | |
167 | static LIST_HEAD(ocfs2_live_connection_list); | |
462c7e6a | 168 | static LIST_HEAD(ocfs2_control_private_list); |
6427a727 JB |
169 | static DEFINE_MUTEX(ocfs2_control_lock); |
170 | ||
462c7e6a JB |
171 | static inline void ocfs2_control_set_handshake_state(struct file *file, |
172 | int state) | |
173 | { | |
174 | struct ocfs2_control_private *p = file->private_data; | |
175 | p->op_state = state; | |
176 | } | |
177 | ||
178 | static inline int ocfs2_control_get_handshake_state(struct file *file) | |
179 | { | |
180 | struct ocfs2_control_private *p = file->private_data; | |
181 | return p->op_state; | |
182 | } | |
183 | ||
6427a727 JB |
184 | static struct ocfs2_live_connection *ocfs2_connection_find(const char *name) |
185 | { | |
186 | size_t len = strlen(name); | |
187 | struct ocfs2_live_connection *c; | |
188 | ||
189 | BUG_ON(!mutex_is_locked(&ocfs2_control_lock)); | |
190 | ||
191 | list_for_each_entry(c, &ocfs2_live_connection_list, oc_list) { | |
192 | if ((c->oc_conn->cc_namelen == len) && | |
193 | !strncmp(c->oc_conn->cc_name, name, len)) | |
194 | return c; | |
195 | } | |
196 | ||
226291aa | 197 | return NULL; |
6427a727 JB |
198 | } |
199 | ||
200 | /* | |
201 | * ocfs2_live_connection structures are created underneath the ocfs2 | |
202 | * mount path. Since the VFS prevents multiple calls to | |
203 | * fill_super(), we can't get dupes here. | |
204 | */ | |
24aa3386 GR |
205 | static int ocfs2_live_connection_attach(struct ocfs2_cluster_connection *conn, |
206 | struct ocfs2_live_connection *c) | |
6427a727 JB |
207 | { |
208 | int rc = 0; | |
6427a727 JB |
209 | |
210 | mutex_lock(&ocfs2_control_lock); | |
211 | c->oc_conn = conn; | |
212 | ||
c994c2eb | 213 | if ((c->oc_type == NO_CONTROLD) || atomic_read(&ocfs2_control_opened)) |
6427a727 JB |
214 | list_add(&c->oc_list, &ocfs2_live_connection_list); |
215 | else { | |
216 | printk(KERN_ERR | |
217 | "ocfs2: Userspace control daemon is not present\n"); | |
218 | rc = -ESRCH; | |
219 | } | |
220 | ||
221 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
222 | return rc; |
223 | } | |
224 | ||
225 | /* | |
226 | * This function disconnects the cluster connection from ocfs2_control. | |
227 | * Afterwards, userspace can't affect the cluster connection. | |
228 | */ | |
229 | static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c) | |
230 | { | |
231 | mutex_lock(&ocfs2_control_lock); | |
232 | list_del_init(&c->oc_list); | |
233 | c->oc_conn = NULL; | |
234 | mutex_unlock(&ocfs2_control_lock); | |
235 | ||
236 | kfree(c); | |
237 | } | |
238 | ||
3cfd4ab6 JB |
239 | static int ocfs2_control_cfu(void *target, size_t target_len, |
240 | const char __user *buf, size_t count) | |
462c7e6a JB |
241 | { |
242 | /* The T01 expects write(2) calls to have exactly one command */ | |
3cfd4ab6 JB |
243 | if ((count != target_len) || |
244 | (count > sizeof(union ocfs2_control_message))) | |
462c7e6a JB |
245 | return -EINVAL; |
246 | ||
247 | if (copy_from_user(target, buf, target_len)) | |
248 | return -EFAULT; | |
249 | ||
3cfd4ab6 | 250 | return 0; |
462c7e6a JB |
251 | } |
252 | ||
3cfd4ab6 JB |
253 | static ssize_t ocfs2_control_validate_protocol(struct file *file, |
254 | const char __user *buf, | |
255 | size_t count) | |
462c7e6a JB |
256 | { |
257 | ssize_t ret; | |
258 | char kbuf[OCFS2_CONTROL_PROTO_LEN]; | |
259 | ||
260 | ret = ocfs2_control_cfu(kbuf, OCFS2_CONTROL_PROTO_LEN, | |
261 | buf, count); | |
3cfd4ab6 | 262 | if (ret) |
462c7e6a JB |
263 | return ret; |
264 | ||
265 | if (strncmp(kbuf, OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN)) | |
266 | return -EINVAL; | |
267 | ||
462c7e6a | 268 | ocfs2_control_set_handshake_state(file, |
3cfd4ab6 | 269 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
462c7e6a JB |
270 | |
271 | return count; | |
272 | } | |
273 | ||
de870ef0 JB |
274 | static void ocfs2_control_send_down(const char *uuid, |
275 | int nodenum) | |
276 | { | |
277 | struct ocfs2_live_connection *c; | |
278 | ||
279 | mutex_lock(&ocfs2_control_lock); | |
280 | ||
281 | c = ocfs2_connection_find(uuid); | |
282 | if (c) { | |
283 | BUG_ON(c->oc_conn == NULL); | |
284 | c->oc_conn->cc_recovery_handler(nodenum, | |
285 | c->oc_conn->cc_recovery_data); | |
286 | } | |
287 | ||
288 | mutex_unlock(&ocfs2_control_lock); | |
289 | } | |
290 | ||
3cfd4ab6 JB |
291 | /* |
292 | * Called whenever configuration elements are sent to /dev/ocfs2_control. | |
293 | * If all configuration elements are present, try to set the global | |
d4b95eef JB |
294 | * values. If there is a problem, return an error. Skip any missing |
295 | * elements, and only bump ocfs2_control_opened when we have all elements | |
296 | * and are successful. | |
3cfd4ab6 JB |
297 | */ |
298 | static int ocfs2_control_install_private(struct file *file) | |
299 | { | |
300 | int rc = 0; | |
301 | int set_p = 1; | |
302 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 303 | |
3cfd4ab6 JB |
304 | BUG_ON(p->op_state != OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
305 | ||
d4b95eef JB |
306 | mutex_lock(&ocfs2_control_lock); |
307 | ||
308 | if (p->op_this_node < 0) { | |
3cfd4ab6 | 309 | set_p = 0; |
d4b95eef JB |
310 | } else if ((ocfs2_control_this_node >= 0) && |
311 | (ocfs2_control_this_node != p->op_this_node)) { | |
312 | rc = -EINVAL; | |
313 | goto out_unlock; | |
314 | } | |
3cfd4ab6 | 315 | |
d4b95eef JB |
316 | if (!p->op_proto.pv_major) { |
317 | set_p = 0; | |
318 | } else if (!list_empty(&ocfs2_live_connection_list) && | |
319 | ((running_proto.pv_major != p->op_proto.pv_major) || | |
320 | (running_proto.pv_minor != p->op_proto.pv_minor))) { | |
3cfd4ab6 | 321 | rc = -EINVAL; |
d4b95eef JB |
322 | goto out_unlock; |
323 | } | |
324 | ||
325 | if (set_p) { | |
326 | ocfs2_control_this_node = p->op_this_node; | |
327 | running_proto.pv_major = p->op_proto.pv_major; | |
328 | running_proto.pv_minor = p->op_proto.pv_minor; | |
329 | } | |
330 | ||
331 | out_unlock: | |
3cfd4ab6 JB |
332 | mutex_unlock(&ocfs2_control_lock); |
333 | ||
334 | if (!rc && set_p) { | |
335 | /* We set the global values successfully */ | |
336 | atomic_inc(&ocfs2_control_opened); | |
337 | ocfs2_control_set_handshake_state(file, | |
338 | OCFS2_CONTROL_HANDSHAKE_VALID); | |
339 | } | |
340 | ||
341 | return rc; | |
342 | } | |
343 | ||
cf4d8d75 DT |
344 | static int ocfs2_control_get_this_node(void) |
345 | { | |
346 | int rc; | |
347 | ||
348 | mutex_lock(&ocfs2_control_lock); | |
349 | if (ocfs2_control_this_node < 0) | |
350 | rc = -EINVAL; | |
351 | else | |
352 | rc = ocfs2_control_this_node; | |
353 | mutex_unlock(&ocfs2_control_lock); | |
354 | ||
355 | return rc; | |
356 | } | |
357 | ||
3cfd4ab6 JB |
358 | static int ocfs2_control_do_setnode_msg(struct file *file, |
359 | struct ocfs2_control_message_setn *msg) | |
de870ef0 | 360 | { |
de870ef0 | 361 | long nodenum; |
3cfd4ab6 JB |
362 | char *ptr = NULL; |
363 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 364 | |
3cfd4ab6 JB |
365 | if (ocfs2_control_get_handshake_state(file) != |
366 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
367 | return -EINVAL; | |
de870ef0 | 368 | |
3cfd4ab6 JB |
369 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, |
370 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
371 | return -EINVAL; | |
372 | ||
373 | if ((msg->space != ' ') || (msg->newline != '\n')) | |
374 | return -EINVAL; | |
375 | msg->space = msg->newline = '\0'; | |
376 | ||
377 | nodenum = simple_strtol(msg->nodestr, &ptr, 16); | |
378 | if (!ptr || *ptr) | |
379 | return -EINVAL; | |
380 | ||
381 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
382 | (nodenum > INT_MAX) || (nodenum < 0)) | |
383 | return -ERANGE; | |
384 | p->op_this_node = nodenum; | |
385 | ||
386 | return ocfs2_control_install_private(file); | |
387 | } | |
388 | ||
d4b95eef JB |
389 | static int ocfs2_control_do_setversion_msg(struct file *file, |
390 | struct ocfs2_control_message_setv *msg) | |
447a5647 | 391 | { |
d4b95eef JB |
392 | long major, minor; |
393 | char *ptr = NULL; | |
394 | struct ocfs2_control_private *p = file->private_data; | |
395 | struct ocfs2_protocol_version *max = | |
e603cfb0 | 396 | &ocfs2_user_plugin.sp_max_proto; |
d4b95eef JB |
397 | |
398 | if (ocfs2_control_get_handshake_state(file) != | |
399 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
400 | return -EINVAL; | |
401 | ||
402 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
403 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
404 | return -EINVAL; | |
405 | ||
406 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || | |
407 | (msg->newline != '\n')) | |
408 | return -EINVAL; | |
409 | msg->space1 = msg->space2 = msg->newline = '\0'; | |
410 | ||
411 | major = simple_strtol(msg->major, &ptr, 16); | |
412 | if (!ptr || *ptr) | |
413 | return -EINVAL; | |
414 | minor = simple_strtol(msg->minor, &ptr, 16); | |
415 | if (!ptr || *ptr) | |
416 | return -EINVAL; | |
417 | ||
418 | /* | |
419 | * The major must be between 1 and 255, inclusive. The minor | |
420 | * must be between 0 and 255, inclusive. The version passed in | |
421 | * must be within the maximum version supported by the filesystem. | |
422 | */ | |
423 | if ((major == LONG_MIN) || (major == LONG_MAX) || | |
424 | (major > (u8)-1) || (major < 1)) | |
425 | return -ERANGE; | |
426 | if ((minor == LONG_MIN) || (minor == LONG_MAX) || | |
427 | (minor > (u8)-1) || (minor < 0)) | |
428 | return -ERANGE; | |
429 | if ((major != max->pv_major) || | |
430 | (minor > max->pv_minor)) | |
431 | return -EINVAL; | |
432 | ||
433 | p->op_proto.pv_major = major; | |
434 | p->op_proto.pv_minor = minor; | |
435 | ||
436 | return ocfs2_control_install_private(file); | |
437 | } | |
438 | ||
3cfd4ab6 JB |
439 | static int ocfs2_control_do_down_msg(struct file *file, |
440 | struct ocfs2_control_message_down *msg) | |
441 | { | |
442 | long nodenum; | |
443 | char *p = NULL; | |
444 | ||
445 | if (ocfs2_control_get_handshake_state(file) != | |
446 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
447 | return -EINVAL; | |
de870ef0 | 448 | |
3cfd4ab6 JB |
449 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, |
450 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
de870ef0 JB |
451 | return -EINVAL; |
452 | ||
3cfd4ab6 JB |
453 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || |
454 | (msg->newline != '\n')) | |
de870ef0 | 455 | return -EINVAL; |
3cfd4ab6 | 456 | msg->space1 = msg->space2 = msg->newline = '\0'; |
de870ef0 | 457 | |
3cfd4ab6 | 458 | nodenum = simple_strtol(msg->nodestr, &p, 16); |
de870ef0 JB |
459 | if (!p || *p) |
460 | return -EINVAL; | |
461 | ||
462 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
463 | (nodenum > INT_MAX) || (nodenum < 0)) | |
464 | return -ERANGE; | |
465 | ||
3cfd4ab6 | 466 | ocfs2_control_send_down(msg->uuid, nodenum); |
de870ef0 | 467 | |
3cfd4ab6 JB |
468 | return 0; |
469 | } | |
470 | ||
471 | static ssize_t ocfs2_control_message(struct file *file, | |
472 | const char __user *buf, | |
473 | size_t count) | |
474 | { | |
475 | ssize_t ret; | |
476 | union ocfs2_control_message msg; | |
477 | ||
478 | /* Try to catch padding issues */ | |
479 | WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) != | |
480 | (sizeof(msg.u_down.tag) + sizeof(msg.u_down.space1))); | |
481 | ||
482 | memset(&msg, 0, sizeof(union ocfs2_control_message)); | |
483 | ret = ocfs2_control_cfu(&msg, count, buf, count); | |
484 | if (ret) | |
485 | goto out; | |
486 | ||
487 | if ((count == OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN) && | |
488 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, | |
489 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
490 | ret = ocfs2_control_do_setnode_msg(file, &msg.u_setn); | |
d4b95eef JB |
491 | else if ((count == OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN) && |
492 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
493 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
494 | ret = ocfs2_control_do_setversion_msg(file, &msg.u_setv); | |
3cfd4ab6 JB |
495 | else if ((count == OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN) && |
496 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, | |
497 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
498 | ret = ocfs2_control_do_down_msg(file, &msg.u_down); | |
499 | else | |
500 | ret = -EINVAL; | |
501 | ||
502 | out: | |
503 | return ret ? ret : count; | |
de870ef0 | 504 | } |
6427a727 JB |
505 | |
506 | static ssize_t ocfs2_control_write(struct file *file, | |
507 | const char __user *buf, | |
508 | size_t count, | |
509 | loff_t *ppos) | |
8adf0536 | 510 | { |
462c7e6a JB |
511 | ssize_t ret; |
512 | ||
513 | switch (ocfs2_control_get_handshake_state(file)) { | |
514 | case OCFS2_CONTROL_HANDSHAKE_INVALID: | |
515 | ret = -EINVAL; | |
516 | break; | |
517 | ||
518 | case OCFS2_CONTROL_HANDSHAKE_READ: | |
3cfd4ab6 JB |
519 | ret = ocfs2_control_validate_protocol(file, buf, |
520 | count); | |
462c7e6a JB |
521 | break; |
522 | ||
3cfd4ab6 | 523 | case OCFS2_CONTROL_HANDSHAKE_PROTOCOL: |
462c7e6a | 524 | case OCFS2_CONTROL_HANDSHAKE_VALID: |
de870ef0 | 525 | ret = ocfs2_control_message(file, buf, count); |
462c7e6a JB |
526 | break; |
527 | ||
528 | default: | |
529 | BUG(); | |
530 | ret = -EIO; | |
531 | break; | |
532 | } | |
533 | ||
534 | return ret; | |
8adf0536 JB |
535 | } |
536 | ||
462c7e6a JB |
537 | /* |
538 | * This is a naive version. If we ever have a new protocol, we'll expand | |
539 | * it. Probably using seq_file. | |
540 | */ | |
6427a727 JB |
541 | static ssize_t ocfs2_control_read(struct file *file, |
542 | char __user *buf, | |
543 | size_t count, | |
544 | loff_t *ppos) | |
545 | { | |
7600c72b | 546 | ssize_t ret; |
462c7e6a | 547 | |
7600c72b AM |
548 | ret = simple_read_from_buffer(buf, count, ppos, |
549 | OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN); | |
462c7e6a JB |
550 | |
551 | /* Have we read the whole protocol list? */ | |
7600c72b | 552 | if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN) |
462c7e6a JB |
553 | ocfs2_control_set_handshake_state(file, |
554 | OCFS2_CONTROL_HANDSHAKE_READ); | |
555 | ||
7600c72b | 556 | return ret; |
6427a727 JB |
557 | } |
558 | ||
559 | static int ocfs2_control_release(struct inode *inode, struct file *file) | |
560 | { | |
462c7e6a JB |
561 | struct ocfs2_control_private *p = file->private_data; |
562 | ||
563 | mutex_lock(&ocfs2_control_lock); | |
564 | ||
565 | if (ocfs2_control_get_handshake_state(file) != | |
566 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
567 | goto out; | |
568 | ||
6427a727 | 569 | if (atomic_dec_and_test(&ocfs2_control_opened)) { |
6427a727 JB |
570 | if (!list_empty(&ocfs2_live_connection_list)) { |
571 | /* XXX: Do bad things! */ | |
572 | printk(KERN_ERR | |
573 | "ocfs2: Unexpected release of ocfs2_control!\n" | |
574 | " Loss of cluster connection requires " | |
575 | "an emergency restart!\n"); | |
576 | emergency_restart(); | |
577 | } | |
d4b95eef JB |
578 | /* |
579 | * Last valid close clears the node number and resets | |
580 | * the locking protocol version | |
581 | */ | |
3cfd4ab6 | 582 | ocfs2_control_this_node = -1; |
d4b95eef | 583 | running_proto.pv_major = 0; |
98acbf63 | 584 | running_proto.pv_minor = 0; |
6427a727 JB |
585 | } |
586 | ||
462c7e6a JB |
587 | out: |
588 | list_del_init(&p->op_list); | |
589 | file->private_data = NULL; | |
590 | ||
591 | mutex_unlock(&ocfs2_control_lock); | |
592 | ||
593 | kfree(p); | |
594 | ||
6427a727 JB |
595 | return 0; |
596 | } | |
597 | ||
598 | static int ocfs2_control_open(struct inode *inode, struct file *file) | |
599 | { | |
462c7e6a JB |
600 | struct ocfs2_control_private *p; |
601 | ||
602 | p = kzalloc(sizeof(struct ocfs2_control_private), GFP_KERNEL); | |
603 | if (!p) | |
604 | return -ENOMEM; | |
3cfd4ab6 | 605 | p->op_this_node = -1; |
462c7e6a JB |
606 | |
607 | mutex_lock(&ocfs2_control_lock); | |
608 | file->private_data = p; | |
609 | list_add(&p->op_list, &ocfs2_control_private_list); | |
610 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
611 | |
612 | return 0; | |
613 | } | |
614 | ||
615 | static const struct file_operations ocfs2_control_fops = { | |
616 | .open = ocfs2_control_open, | |
617 | .release = ocfs2_control_release, | |
618 | .read = ocfs2_control_read, | |
619 | .write = ocfs2_control_write, | |
620 | .owner = THIS_MODULE, | |
6038f373 | 621 | .llseek = default_llseek, |
6427a727 JB |
622 | }; |
623 | ||
4d8755b5 | 624 | static struct miscdevice ocfs2_control_device = { |
6427a727 JB |
625 | .minor = MISC_DYNAMIC_MINOR, |
626 | .name = "ocfs2_control", | |
627 | .fops = &ocfs2_control_fops, | |
628 | }; | |
629 | ||
630 | static int ocfs2_control_init(void) | |
631 | { | |
632 | int rc; | |
633 | ||
634 | atomic_set(&ocfs2_control_opened, 0); | |
635 | ||
636 | rc = misc_register(&ocfs2_control_device); | |
637 | if (rc) | |
638 | printk(KERN_ERR | |
639 | "ocfs2: Unable to register ocfs2_control device " | |
640 | "(errno %d)\n", | |
641 | -rc); | |
642 | ||
643 | return rc; | |
644 | } | |
645 | ||
646 | static void ocfs2_control_exit(void) | |
647 | { | |
f368ed60 | 648 | misc_deregister(&ocfs2_control_device); |
6427a727 JB |
649 | } |
650 | ||
cf4d8d75 DT |
651 | static void fsdlm_lock_ast_wrapper(void *astarg) |
652 | { | |
c0e41338 | 653 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 654 | int status = lksb->lksb_fsdlm.sb_status; |
cf4d8d75 | 655 | |
cf4d8d75 DT |
656 | /* |
657 | * For now we're punting on the issue of other non-standard errors | |
658 | * where we can't tell if the unlock_ast or lock_ast should be called. | |
659 | * The main "other error" that's possible is EINVAL which means the | |
660 | * function was called with invalid args, which shouldn't be possible | |
661 | * since the caller here is under our control. Other non-standard | |
662 | * errors probably fall into the same category, or otherwise are fatal | |
663 | * which means we can't carry on anyway. | |
664 | */ | |
665 | ||
666 | if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL) | |
110946c8 | 667 | lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, 0); |
cf4d8d75 | 668 | else |
110946c8 | 669 | lksb->lksb_conn->cc_proto->lp_lock_ast(lksb); |
cf4d8d75 DT |
670 | } |
671 | ||
672 | static void fsdlm_blocking_ast_wrapper(void *astarg, int level) | |
673 | { | |
c0e41338 | 674 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 675 | |
110946c8 | 676 | lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level); |
cf4d8d75 DT |
677 | } |
678 | ||
679 | static int user_dlm_lock(struct ocfs2_cluster_connection *conn, | |
680 | int mode, | |
c0e41338 | 681 | struct ocfs2_dlm_lksb *lksb, |
cf4d8d75 DT |
682 | u32 flags, |
683 | void *name, | |
a796d286 | 684 | unsigned int namelen) |
cf4d8d75 DT |
685 | { |
686 | int ret; | |
687 | ||
688 | if (!lksb->lksb_fsdlm.sb_lvbptr) | |
689 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
690 | sizeof(struct dlm_lksb); | |
691 | ||
692 | ret = dlm_lock(conn->cc_lockspace, mode, &lksb->lksb_fsdlm, | |
693 | flags|DLM_LKF_NODLCKWT, name, namelen, 0, | |
a796d286 | 694 | fsdlm_lock_ast_wrapper, lksb, |
cf4d8d75 DT |
695 | fsdlm_blocking_ast_wrapper); |
696 | return ret; | |
697 | } | |
698 | ||
699 | static int user_dlm_unlock(struct ocfs2_cluster_connection *conn, | |
c0e41338 | 700 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 701 | u32 flags) |
cf4d8d75 DT |
702 | { |
703 | int ret; | |
704 | ||
705 | ret = dlm_unlock(conn->cc_lockspace, lksb->lksb_fsdlm.sb_lkid, | |
a796d286 | 706 | flags, &lksb->lksb_fsdlm, lksb); |
cf4d8d75 DT |
707 | return ret; |
708 | } | |
709 | ||
c0e41338 | 710 | static int user_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
711 | { |
712 | return lksb->lksb_fsdlm.sb_status; | |
713 | } | |
714 | ||
c0e41338 | 715 | static int user_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
716 | { |
717 | int invalid = lksb->lksb_fsdlm.sb_flags & DLM_SBF_VALNOTVALID; | |
718 | ||
719 | return !invalid; | |
720 | } | |
721 | ||
c0e41338 | 722 | static void *user_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 | 723 | { |
66f502a4 DT |
724 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
725 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
726 | sizeof(struct dlm_lksb); | |
cf4d8d75 DT |
727 | return (void *)(lksb->lksb_fsdlm.sb_lvbptr); |
728 | } | |
729 | ||
c0e41338 | 730 | static void user_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
731 | { |
732 | } | |
733 | ||
53da4939 MF |
734 | static int user_plock(struct ocfs2_cluster_connection *conn, |
735 | u64 ino, | |
736 | struct file *file, | |
737 | int cmd, | |
738 | struct file_lock *fl) | |
739 | { | |
740 | /* | |
741 | * This more or less just demuxes the plock request into any | |
742 | * one of three dlm calls. | |
743 | * | |
744 | * Internally, fs/dlm will pass these to a misc device, which | |
745 | * a userspace daemon will read and write to. | |
746 | * | |
747 | * For now, cancel requests (which happen internally only), | |
748 | * are turned into unlocks. Most of this function taken from | |
749 | * gfs2_lock. | |
750 | */ | |
751 | ||
752 | if (cmd == F_CANCELLK) { | |
753 | cmd = F_SETLK; | |
754 | fl->fl_type = F_UNLCK; | |
755 | } | |
756 | ||
757 | if (IS_GETLK(cmd)) | |
758 | return dlm_posix_get(conn->cc_lockspace, ino, file, fl); | |
759 | else if (fl->fl_type == F_UNLCK) | |
760 | return dlm_posix_unlock(conn->cc_lockspace, ino, file, fl); | |
761 | else | |
762 | return dlm_posix_lock(conn->cc_lockspace, ino, file, cmd, fl); | |
763 | } | |
764 | ||
cf4d8d75 DT |
765 | /* |
766 | * Compare a requested locking protocol version against the current one. | |
767 | * | |
768 | * If the major numbers are different, they are incompatible. | |
769 | * If the current minor is greater than the request, they are incompatible. | |
770 | * If the current minor is less than or equal to the request, they are | |
771 | * compatible, and the requester should run at the current minor version. | |
772 | */ | |
773 | static int fs_protocol_compare(struct ocfs2_protocol_version *existing, | |
774 | struct ocfs2_protocol_version *request) | |
775 | { | |
776 | if (existing->pv_major != request->pv_major) | |
777 | return 1; | |
778 | ||
779 | if (existing->pv_minor > request->pv_minor) | |
780 | return 1; | |
781 | ||
782 | if (existing->pv_minor < request->pv_minor) | |
783 | request->pv_minor = existing->pv_minor; | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
41503630 GR |
788 | static void lvb_to_version(char *lvb, struct ocfs2_protocol_version *ver) |
789 | { | |
790 | struct ocfs2_protocol_version *pv = | |
791 | (struct ocfs2_protocol_version *)lvb; | |
792 | /* | |
793 | * ocfs2_protocol_version has two u8 variables, so we don't | |
794 | * need any endian conversion. | |
795 | */ | |
796 | ver->pv_major = pv->pv_major; | |
797 | ver->pv_minor = pv->pv_minor; | |
798 | } | |
799 | ||
800 | static void version_to_lvb(struct ocfs2_protocol_version *ver, char *lvb) | |
801 | { | |
802 | struct ocfs2_protocol_version *pv = | |
803 | (struct ocfs2_protocol_version *)lvb; | |
804 | /* | |
805 | * ocfs2_protocol_version has two u8 variables, so we don't | |
806 | * need any endian conversion. | |
807 | */ | |
808 | pv->pv_major = ver->pv_major; | |
809 | pv->pv_minor = ver->pv_minor; | |
810 | } | |
811 | ||
812 | static void sync_wait_cb(void *arg) | |
813 | { | |
814 | struct ocfs2_cluster_connection *conn = arg; | |
815 | struct ocfs2_live_connection *lc = conn->cc_private; | |
816 | complete(&lc->oc_sync_wait); | |
817 | } | |
818 | ||
819 | static int sync_unlock(struct ocfs2_cluster_connection *conn, | |
820 | struct dlm_lksb *lksb, char *name) | |
821 | { | |
822 | int error; | |
823 | struct ocfs2_live_connection *lc = conn->cc_private; | |
824 | ||
825 | error = dlm_unlock(conn->cc_lockspace, lksb->sb_lkid, 0, lksb, conn); | |
826 | if (error) { | |
827 | printk(KERN_ERR "%s lkid %x error %d\n", | |
828 | name, lksb->sb_lkid, error); | |
829 | return error; | |
830 | } | |
831 | ||
832 | wait_for_completion(&lc->oc_sync_wait); | |
833 | ||
834 | if (lksb->sb_status != -DLM_EUNLOCK) { | |
835 | printk(KERN_ERR "%s lkid %x status %d\n", | |
836 | name, lksb->sb_lkid, lksb->sb_status); | |
837 | return -1; | |
838 | } | |
839 | return 0; | |
840 | } | |
841 | ||
842 | static int sync_lock(struct ocfs2_cluster_connection *conn, | |
843 | int mode, uint32_t flags, | |
844 | struct dlm_lksb *lksb, char *name) | |
845 | { | |
846 | int error, status; | |
847 | struct ocfs2_live_connection *lc = conn->cc_private; | |
848 | ||
849 | error = dlm_lock(conn->cc_lockspace, mode, lksb, flags, | |
850 | name, strlen(name), | |
851 | 0, sync_wait_cb, conn, NULL); | |
852 | if (error) { | |
853 | printk(KERN_ERR "%s lkid %x flags %x mode %d error %d\n", | |
854 | name, lksb->sb_lkid, flags, mode, error); | |
855 | return error; | |
856 | } | |
857 | ||
858 | wait_for_completion(&lc->oc_sync_wait); | |
859 | ||
860 | status = lksb->sb_status; | |
861 | ||
862 | if (status && status != -EAGAIN) { | |
863 | printk(KERN_ERR "%s lkid %x flags %x mode %d status %d\n", | |
864 | name, lksb->sb_lkid, flags, mode, status); | |
865 | } | |
866 | ||
867 | return status; | |
868 | } | |
869 | ||
870 | ||
871 | static int version_lock(struct ocfs2_cluster_connection *conn, int mode, | |
872 | int flags) | |
873 | { | |
874 | struct ocfs2_live_connection *lc = conn->cc_private; | |
875 | return sync_lock(conn, mode, flags, | |
876 | &lc->oc_version_lksb, VERSION_LOCK); | |
877 | } | |
878 | ||
879 | static int version_unlock(struct ocfs2_cluster_connection *conn) | |
880 | { | |
881 | struct ocfs2_live_connection *lc = conn->cc_private; | |
882 | return sync_unlock(conn, &lc->oc_version_lksb, VERSION_LOCK); | |
883 | } | |
884 | ||
c994c2eb GR |
885 | /* get_protocol_version() |
886 | * | |
887 | * To exchange ocfs2 versioning, we use the LVB of the version dlm lock. | |
888 | * The algorithm is: | |
889 | * 1. Attempt to take the lock in EX mode (non-blocking). | |
890 | * 2. If successful (which means it is the first mount), write the | |
891 | * version number and downconvert to PR lock. | |
892 | * 3. If unsuccessful (returns -EAGAIN), read the version from the LVB after | |
893 | * taking the PR lock. | |
894 | */ | |
895 | ||
896 | static int get_protocol_version(struct ocfs2_cluster_connection *conn) | |
897 | { | |
898 | int ret; | |
899 | struct ocfs2_live_connection *lc = conn->cc_private; | |
900 | struct ocfs2_protocol_version pv; | |
901 | ||
902 | running_proto.pv_major = | |
903 | ocfs2_user_plugin.sp_max_proto.pv_major; | |
904 | running_proto.pv_minor = | |
905 | ocfs2_user_plugin.sp_max_proto.pv_minor; | |
906 | ||
907 | lc->oc_version_lksb.sb_lvbptr = lc->oc_lvb; | |
908 | ret = version_lock(conn, DLM_LOCK_EX, | |
909 | DLM_LKF_VALBLK|DLM_LKF_NOQUEUE); | |
910 | if (!ret) { | |
911 | conn->cc_version.pv_major = running_proto.pv_major; | |
912 | conn->cc_version.pv_minor = running_proto.pv_minor; | |
913 | version_to_lvb(&running_proto, lc->oc_lvb); | |
914 | version_lock(conn, DLM_LOCK_PR, DLM_LKF_CONVERT|DLM_LKF_VALBLK); | |
915 | } else if (ret == -EAGAIN) { | |
916 | ret = version_lock(conn, DLM_LOCK_PR, DLM_LKF_VALBLK); | |
917 | if (ret) | |
918 | goto out; | |
919 | lvb_to_version(lc->oc_lvb, &pv); | |
920 | ||
921 | if ((pv.pv_major != running_proto.pv_major) || | |
922 | (pv.pv_minor > running_proto.pv_minor)) { | |
923 | ret = -EINVAL; | |
924 | goto out; | |
925 | } | |
926 | ||
927 | conn->cc_version.pv_major = pv.pv_major; | |
928 | conn->cc_version.pv_minor = pv.pv_minor; | |
929 | } | |
930 | out: | |
931 | return ret; | |
932 | } | |
933 | ||
66e188fc GR |
934 | static void user_recover_prep(void *arg) |
935 | { | |
936 | } | |
937 | ||
938 | static void user_recover_slot(void *arg, struct dlm_slot *slot) | |
939 | { | |
940 | struct ocfs2_cluster_connection *conn = arg; | |
941 | printk(KERN_INFO "ocfs2: Node %d/%d down. Initiating recovery.\n", | |
942 | slot->nodeid, slot->slot); | |
943 | conn->cc_recovery_handler(slot->nodeid, conn->cc_recovery_data); | |
944 | ||
945 | } | |
946 | ||
947 | static void user_recover_done(void *arg, struct dlm_slot *slots, | |
948 | int num_slots, int our_slot, | |
949 | uint32_t generation) | |
950 | { | |
951 | struct ocfs2_cluster_connection *conn = arg; | |
952 | struct ocfs2_live_connection *lc = conn->cc_private; | |
953 | int i; | |
954 | ||
955 | for (i = 0; i < num_slots; i++) | |
956 | if (slots[i].slot == our_slot) { | |
957 | atomic_set(&lc->oc_this_node, slots[i].nodeid); | |
958 | break; | |
959 | } | |
960 | ||
961 | lc->oc_our_slot = our_slot; | |
c994c2eb | 962 | wake_up(&lc->oc_wait); |
66e188fc GR |
963 | } |
964 | ||
16eac4be | 965 | static const struct dlm_lockspace_ops ocfs2_ls_ops = { |
66e188fc GR |
966 | .recover_prep = user_recover_prep, |
967 | .recover_slot = user_recover_slot, | |
968 | .recover_done = user_recover_done, | |
969 | }; | |
970 | ||
c994c2eb GR |
971 | static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn) |
972 | { | |
973 | version_unlock(conn); | |
974 | dlm_release_lockspace(conn->cc_lockspace, 2); | |
975 | conn->cc_lockspace = NULL; | |
976 | ocfs2_live_connection_drop(conn->cc_private); | |
977 | conn->cc_private = NULL; | |
978 | return 0; | |
979 | } | |
980 | ||
cf4d8d75 DT |
981 | static int user_cluster_connect(struct ocfs2_cluster_connection *conn) |
982 | { | |
983 | dlm_lockspace_t *fsdlm; | |
24aa3386 | 984 | struct ocfs2_live_connection *lc; |
c994c2eb | 985 | int rc, ops_rv; |
cf4d8d75 DT |
986 | |
987 | BUG_ON(conn == NULL); | |
988 | ||
24aa3386 | 989 | lc = kzalloc(sizeof(struct ocfs2_live_connection), GFP_KERNEL); |
43ee9cad ME |
990 | if (!lc) |
991 | return -ENOMEM; | |
24aa3386 | 992 | |
c994c2eb GR |
993 | init_waitqueue_head(&lc->oc_wait); |
994 | init_completion(&lc->oc_sync_wait); | |
995 | atomic_set(&lc->oc_this_node, 0); | |
996 | conn->cc_private = lc; | |
997 | lc->oc_type = NO_CONTROLD; | |
998 | ||
999 | rc = dlm_new_lockspace(conn->cc_name, conn->cc_cluster_name, | |
01a36b67 | 1000 | DLM_LSFL_FS | DLM_LSFL_NEWEXCL, DLM_LVB_LEN, |
c994c2eb | 1001 | &ocfs2_ls_ops, conn, &ops_rv, &fsdlm); |
01a36b67 GH |
1002 | if (rc) { |
1003 | if (rc == -EEXIST || rc == -EPROTO) | |
1004 | printk(KERN_ERR "ocfs2: Unable to create the " | |
1005 | "lockspace %s (%d), because a ocfs2-tools " | |
1006 | "program is running on this file system " | |
1007 | "with the same name lockspace\n", | |
1008 | conn->cc_name, rc); | |
c994c2eb | 1009 | goto out; |
01a36b67 | 1010 | } |
c994c2eb GR |
1011 | |
1012 | if (ops_rv == -EOPNOTSUPP) { | |
1013 | lc->oc_type = WITH_CONTROLD; | |
1014 | printk(KERN_NOTICE "ocfs2: You seem to be using an older " | |
1015 | "version of dlm_controld and/or ocfs2-tools." | |
1016 | " Please consider upgrading.\n"); | |
1017 | } else if (ops_rv) { | |
1018 | rc = ops_rv; | |
1019 | goto out; | |
1020 | } | |
1021 | conn->cc_lockspace = fsdlm; | |
1022 | ||
24aa3386 | 1023 | rc = ocfs2_live_connection_attach(conn, lc); |
cf4d8d75 DT |
1024 | if (rc) |
1025 | goto out; | |
1026 | ||
c994c2eb GR |
1027 | if (lc->oc_type == NO_CONTROLD) { |
1028 | rc = get_protocol_version(conn); | |
1029 | if (rc) { | |
1030 | printk(KERN_ERR "ocfs2: Could not determine" | |
1031 | " locking version\n"); | |
1032 | user_cluster_disconnect(conn); | |
1033 | goto out; | |
1034 | } | |
1035 | wait_event(lc->oc_wait, (atomic_read(&lc->oc_this_node) > 0)); | |
1036 | } | |
1037 | ||
cf4d8d75 DT |
1038 | /* |
1039 | * running_proto must have been set before we allowed any mounts | |
1040 | * to proceed. | |
1041 | */ | |
1042 | if (fs_protocol_compare(&running_proto, &conn->cc_version)) { | |
1043 | printk(KERN_ERR | |
1044 | "Unable to mount with fs locking protocol version " | |
c994c2eb | 1045 | "%u.%u because negotiated protocol is %u.%u\n", |
cf4d8d75 DT |
1046 | conn->cc_version.pv_major, conn->cc_version.pv_minor, |
1047 | running_proto.pv_major, running_proto.pv_minor); | |
1048 | rc = -EPROTO; | |
24aa3386 GR |
1049 | ocfs2_live_connection_drop(lc); |
1050 | lc = NULL; | |
cf4d8d75 DT |
1051 | } |
1052 | ||
cf4d8d75 | 1053 | out: |
fd90d4df | 1054 | if (rc) |
24aa3386 | 1055 | kfree(lc); |
cf4d8d75 DT |
1056 | return rc; |
1057 | } | |
1058 | ||
cf4d8d75 | 1059 | |
3e834151 GR |
1060 | static int user_cluster_this_node(struct ocfs2_cluster_connection *conn, |
1061 | unsigned int *this_node) | |
cf4d8d75 DT |
1062 | { |
1063 | int rc; | |
3e834151 | 1064 | struct ocfs2_live_connection *lc = conn->cc_private; |
cf4d8d75 | 1065 | |
3e834151 GR |
1066 | if (lc->oc_type == WITH_CONTROLD) |
1067 | rc = ocfs2_control_get_this_node(); | |
c994c2eb GR |
1068 | else if (lc->oc_type == NO_CONTROLD) |
1069 | rc = atomic_read(&lc->oc_this_node); | |
3e834151 GR |
1070 | else |
1071 | rc = -EINVAL; | |
c994c2eb | 1072 | |
cf4d8d75 DT |
1073 | if (rc < 0) |
1074 | return rc; | |
1075 | ||
1076 | *this_node = rc; | |
1077 | return 0; | |
1078 | } | |
1079 | ||
a12630b1 | 1080 | static struct ocfs2_stack_operations ocfs2_user_plugin_ops = { |
cf4d8d75 DT |
1081 | .connect = user_cluster_connect, |
1082 | .disconnect = user_cluster_disconnect, | |
1083 | .this_node = user_cluster_this_node, | |
1084 | .dlm_lock = user_dlm_lock, | |
1085 | .dlm_unlock = user_dlm_unlock, | |
1086 | .lock_status = user_dlm_lock_status, | |
1c520dfb | 1087 | .lvb_valid = user_dlm_lvb_valid, |
cf4d8d75 | 1088 | .lock_lvb = user_dlm_lvb, |
53da4939 | 1089 | .plock = user_plock, |
cf4d8d75 DT |
1090 | .dump_lksb = user_dlm_dump_lksb, |
1091 | }; | |
1092 | ||
a12630b1 | 1093 | static struct ocfs2_stack_plugin ocfs2_user_plugin = { |
cf4d8d75 | 1094 | .sp_name = "user", |
a12630b1 | 1095 | .sp_ops = &ocfs2_user_plugin_ops, |
cf4d8d75 DT |
1096 | .sp_owner = THIS_MODULE, |
1097 | }; | |
1098 | ||
1099 | ||
a12630b1 | 1100 | static int __init ocfs2_user_plugin_init(void) |
6427a727 | 1101 | { |
cf4d8d75 DT |
1102 | int rc; |
1103 | ||
1104 | rc = ocfs2_control_init(); | |
1105 | if (!rc) { | |
a12630b1 | 1106 | rc = ocfs2_stack_glue_register(&ocfs2_user_plugin); |
cf4d8d75 DT |
1107 | if (rc) |
1108 | ocfs2_control_exit(); | |
1109 | } | |
1110 | ||
1111 | return rc; | |
6427a727 JB |
1112 | } |
1113 | ||
a12630b1 | 1114 | static void __exit ocfs2_user_plugin_exit(void) |
8adf0536 | 1115 | { |
a12630b1 | 1116 | ocfs2_stack_glue_unregister(&ocfs2_user_plugin); |
6427a727 | 1117 | ocfs2_control_exit(); |
8adf0536 JB |
1118 | } |
1119 | ||
1120 | MODULE_AUTHOR("Oracle"); | |
1121 | MODULE_DESCRIPTION("ocfs2 driver for userspace cluster stacks"); | |
1122 | MODULE_LICENSE("GPL"); | |
a12630b1 JB |
1123 | module_init(ocfs2_user_plugin_init); |
1124 | module_exit(ocfs2_user_plugin_exit); |